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Submerge is defined as to cover over, or to place or go under water. An example of to submerge is to put a toy boat completely under the bath water. transitive verb.
Define substratum. substratum synonyms, substratum pronunciation, substratum translation, English dictionary definition of substratum. ) n. pl. subÂ·straÂ·ta ) or subÂ·straÂ·tums 1. a. An underlying layer. b. A layer of earth beneath the surface soil; subsoil. 2. A foundation or groundwork.